<template>
  <div class="todo-footer" v-show="allTodo">
    <label>
      <!-- <input type="checkbox" :checked="isAll" @change="checkAll" /> -->
      <input type="checkbox" v-model="isAll" />
    </label>
    <span>
      <span>已完成{{ finished }}</span> / 全部{{ allTodo }}
    </span>
    <button class="btn btn-danger" @click="clearAll">清除已完成任务</button>
  </div>
</template>

<script>
export default {
  name: "MyFooter",
  props: ["todos"],
  computed: {
    finished() {
      // return this.todos.filter((todo) => {
      //   return todo.done === true;
      // }).length;
      return this.todos.reduce(
        (pre, current) => pre + (current.done ? 1 : 0),
        0
      );
    },

    allTodo() {
      return this.todos.reduce((pre, current) => pre + 1, 0);
    },

    isAll: {
      get() {
        return this.allTodo === this.finished && this.allTodo > 0;
      },
      set(value) {
        // this.checkAllTodo(value);
        this.$emit("checkAllTodo", value);
      },
    },
  },
  methods: {
    // checkAll(e) {
    //   this.checkAllTodo(e.target.checked);
    // },
    clearAll() {
      // this.deleteAllTodo();
      this.$emit("deleteAllTodo");
    },
  },
};
</script>

<style scoped>
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>